Recipe Recording Audio Files

Recording audio using MediaRecorder is similar to playback from the previous recipe, except a few more things need to be specified (note, default can also be used and is the same as the first choice in these lists):

■ MediaRecorder.AudioSource:

■ voice_uplink—Transmitted audio during voice call

■ voice_downlink—Received audio during voice call

■ V0ICE_CALL—Both uplink and downlink audio during voice call

■ camcorder—Microphone associated with camera if available

■ voice_recognition—Microphone tuned for voice recognition if available

■ MediaRecorder.OutputFormat:

■ three_GPP—3GPP media file format

■ amr_nb—Adaptive multirate narrowband file format

■ MediaRecorder.AudioEncoder:

■ amr_nb—Adaptive multirate narrowband vocoder The steps to record audio are

1. Create an instance of the MediaRecorder: MediaRecorder m_Recorder = new MediaRecorder();

2. Specify the source of media, for example the microphone: m_Recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

3. Set the output file format and encoding, such as: m_Recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); m_Recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

4. Set the path for the file to be saved: m_Recorder.setOutputFile(path);

5. Prepare and start the recording: m_Recorder.prepare(); m_Recorder.start();

These steps for audio recording can be used just as they were in the previous recipe for playback.

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